fess vs unbosom

fess

adj
  • Of animals, bad-tempered, fierce. 

  • Lively; active; strong. 

  • Proud; conceited. 

noun
  • A horizontal band across the middle of the shield. 

verb
  • To confess; to admit. 

unbosom

How often have the words fess and unbosom occurred in a corpus of books? (source: Google Ngram Viewer )